baber/WOPTO huggingface dataset:
Patent KR-20110132833-A (KR)
Title: Led module control circuit
Inventor: GYEUNG JE HYEUN
IPC: H05B37/02
Filed: 2010-06-03
Abstract: PURPOSE: An LED module control circuit is provided to protect an iris and an optic nerve by slowly turning on an LED module using illumination sensing function and slowly turning off the LED module after 30 second. CONSTITUTION: An amplification and comparison unit(2) amplifies a signal which is detected by a human detection sensor(1) to a fixed level and compare with set data. An LED lighting delay and illumination detector(3) delays LED lighting for a predetermined time and senses illumination. An oscillator(5) for fade out generates a fade signal for delaying the LED lighting. A fade in and LED switching unit(7) fades in and switches an LED module by an output stage signal of the LED lighting delay and illumination detector.
Patent KR-20110134695-A (KR)
Title: Gasket having beads for prevention of alien substance
Inventor: JANG JAE KYU
IPC: F02F11/00
Filed: 2010-06-09
Abstract: PURPOSE: A gasket having a bead for preventing the foreign material is provided to improve the sealing function of a gasket by secluding the inserting of the foreign material through the forming of a half bead or a full bead. CONSTITUTION: A gasket having a bead for preventing the foreign material comprises top and bottom faceted planes(103,104) and top and bottom beads. The faceted plane is extended from a peripheral bead and respectively surface-contacts at the upper part of the cylinder head lower part and cylinder block. The top and bottom beads are extended from the faceted plane and are broken at a predetermined slope angle respectively. The top and bottom beads each other come in contact with each other in order that the foreign material is unable to be penetrated from outside.
Patent KR-20110138783-A (KR)
Title: Knuckle bracket of a shock absorber and manufacturing method thereof
Inventor: KANG JU HWAN
IPC: F16F9/54
Filed: 2010-06-22
Abstract: PURPOSE: An integrated knuckle bracket of a shock absorber and a manufacturing method thereof are provided to reduce the effort, time and cost required to the manufacturing and installation of a separate bracket for attaching an exterior component. CONSTITUTION: An integrated knuckle bracket of a shock absorber comprises a body portion(11), a flange portion(15) and an attaching unit. The body portion is fixed in order to protect the outer circumference of the shock absorber. The flange portion is parallelly extended from the body portion. A pair of the flange portions is formed. The attaching unit is cut in order that a part of the body portion is opened. The attaching unit attaches the exterior component. The body portion, flange portion and the attaching unit are formed with one metal plate as one body.
Patent KR-20120000840-A (KR)
Title: Braking control system for the vehicle and method of the same
Inventor: KIM JONG SUNG
IPC: B60T13/74
Filed: 2010-06-28
Abstract: PURPOSE: A brake control system and a breaking control method of a vehicle are provided to control an electric break using two central control unit while omitting a local unit installed in each wheels, however, selectively control the electric break in consideration of a priority for preparing an emergency. CONSTITUTION: A brake control system of a vehicle comprises first and second control units(100,200). The first control unit controls first and second electric breaks(110,120) by receiving breaking signals. The first control unit controls third and forth electric breaks by receiving breaking signals. In case a failure occurred in one of first and second control units, the other control unit selectively controls one or more of electric breaks among the four electric breaks. In case a failure occurred in the first control unit, the second control unit selectively controls operable electric break among the four electric breaks in consideration of the failure occurred.
Patent KR-20120001463-A (KR)
Inventor: SEONG JONG HYUN
IPC: B28B7/38
Filed: 2010-06-29
Abstract: 본 발명의 모르타르 몰드에 관한 것으로서, 소정의 중심부로부터 동일 직경을 갖는 반원형의 내경부와 상기 내경부로 부터 방사상으로 연장되어 반타원형을 형성하는 외경부를 갖는 판 형상의 커버틀과, 상기 커버틀의 둘레를 따라 상기 커버틀의 판면에 대해 수직하게 절곡 연장되는 결합부를 갖는 한 쌍의 커버와; 반원통 형상으로 형성되며 상호 마주보게 결합되어 내측에 상하로 개구된 수용부를 갖는 원통체를 형성하는 한 쌍의 성형틀과, 상기 한 쌍의 성형틀의 상단 둘레를 따라 형성되며 상기 한 쌍의 커버의 각 결합부가 결합되는 결합홈을 갖는 몸체부와; 상기 수용부의 개구된 하단을 차폐하는 디스크를 포함하는 것을 특징으로 한다. 
이에 의해, 본 발명에 따른 모르타르용 몰드는 몸체부의 청소시 몸체부에 묻어 있는 잔여 모르타르를 털어내기 위해 몸체부의 테두리에 충격을 가하더라도 몸체부의 테두리에 커버가 견고하게 결합되어 있어 커버가 이탈되지 않으며, 우그러지거나 휘어지는 변형이 없어 모르타르 몰드의 수명을 연장시킬 수 있다.
Patent KR-20120004008-A (KR)
Title: Hammer apparatus
Inventor: HWANG JONG MIN
IPC: B25C1/18
Filed: 2010-07-06
Abstract: PURPOSE: After the anchor or the nail is fixed to the top end portion of the hit bar, it is driven into a ceiling slab or the wall by the air. The anchor or the nail is securely installed. CONSTITUTION: A hammer apparatus(100) comprises a handle(110), a head(140), a piston, a striking bar(150), and a cap(180). A lever(111) controlling the supply of the air is installed in one side of handle to be possible rotatably. In the closed cross section which is faced to the flow path of the head with handle, it is perforated through the inside along thickness from a closed section facing the handle. The piston is embedded in the head. In the flow path of the piston the outer side surface, it is penetrated according to the center axial hole to the closed cross section of the head. The striking bar is inserted through the elastic means into the head, it is hit with the piston. The fixing piece sticking in ceiling or the wall is installed in the end part of the striking bar detachably. The cap is coupled to the head, the separation of the carried the striking bar is prevented.
Patent KR-20120008395-A (KR)
Title: Portable terminal
Inventor: SUN PHILL WON
IPC: H04B1/38
Filed: 2010-07-16
Abstract: PURPOSE: A portable terminal is provided to expand the method of input or control by diversifying a unit for touch sense and to enhance the convenience of a user. CONSTITUTION: A main body(101) has a front surface capable of touch input of a portable terminal. A transparent flip(110) is formed to cover the front side. The transparent flip is connected to be opened to the main body. The flip includes a first display and a touch sensitive layer. The touch sensitive layer is formed to sense touch applied to flip.
Patent KR-20110111212-A (KR)
Inventor: LEE JUN HYUP
IPC: C08G73/10
Filed: 2010-07-16
Abstract: 본 발명은 액정표시장치의 색 특성 또는 시인성을 향상시키 위해 액정 분자들의 거동을 조절하는 화소전극 표시판 및 액정표시판 조립체 및 이들을 제조하는 방법들에 관한 것이다.  
 상기 액정표시판 조립체는 상부 표시판과 하부 표시판 사이에 위치한 액정층, 상부 표시판을 구성하며 상부기판에 형성된 공통전극, 상기 하부 표시판을 구성하며, 상기 상부기판과 대향하는 하부기판 상에 행렬 형태로 형성되고 상기 공통 전극을 마주하고 기본색들을 나타내는 복수의 화소들을 가지는 기본화소군, 상기 화소들의 각각에 포함된 제1 영역에 형성된 제1 부화소와 제2 영역에 형성된 제2 부화소, 상기 제1 부화소에 포함되고, 상기 상부 표시판 또는 상기 하부 표시판에 부착된 편광자의 편광축에 대하여 형성된 제1 각도 방향으로 평행하게 형성된 복수의 제1 미세 가지들을 갖는 제1 부화소 전극, 상기 제1 미세 가지들과 실질적으로 수직방향으로 미리 결정된 제1 폭을 가지며 상기 제1 미세 가지들 사이에 형성된 복수의 제1 미세 슬릿들, 상기 제2 부화소에 포함되고, 상기 상부 표시판 또는 상기 하부 표시판에 부착된 편광자의 편광축에 대하여 형성된 제2 각도 방향으로 평행하게 형성된 복수의 제2 미세 가지들을 갖는 제2 부화소 전극, 상기 제2 미세 가지들과 실질적으로 수직방향으로 미리 결정된 제2 폭을 가지며 상기 제2 미세 가지들 사이에 형성된 복수의 제2 미세 슬릿들, 및 상기 기본화소군의 상기 제1 부화소들과 상기 제2 부화소들 중 선택된 적어도 하나의 부화소에 형성된 상기 제1과 제2 폭들 중 어느 하나는 나머지 선택되지 않은 상기 부화소들에 형성된 상기 제1과 제2 폭들 중 어느 하나와 다름을 포함한다.
Patent KR-20120008570-A (KR)
Inventor: YOON IL SHIK
IPC: E06B3/72
Filed: 2010-07-19
Abstract: PURPOSE: A glass plate fixing apparatus of an elevator door is provided to prevent the exposure of the whole fixing apparatus because of a small width thereof. CONSTITUTION: A glass plate fixing apparatus of an elevator door comprises a support(A1) and fasteners(A2). The support has an L-shaped cross section and is installed along the edges of a glass plate to simultaneously support the edges and outer surface of the glass plate(20). The fasteners include screws and bolts that are fixed to the surface of a door(D) by passing through the support.
Patent KR-20120015907-A (KR)
Title: Media detecting apparatus of automated teller machine
Inventor: MOON CHANG HO
IPC: B65H7/02
Filed: 2010-08-13
Abstract: PURPOSE: A medium sensing apparatus of an automatic teller machine is provided to accurately sense a medium which is transferred regardless of fat which is generated when the medium moves, installation distance of a sensor, or alignment of the sensor. CONSTITUTION: A medium sensing apparatus comprises a medium detecting part(300) and a detecting sensor(400). The medium detecting part comprises a rotary axis(330), a first link which rotates with the rotary axis as the center by the contact with a medium, and a second link(320) which rotates by being connected to the first link. The detecting sensor senses movement of the second link of the medium detecting part. The detection sensor is composed of a light-emitting part and a light receiving part.
Patent KR-20120021798-A (KR)
Title: Methods for preparing high purity chlorophyll and chlorin e6 from chlorophyll extracts
Inventor: KIM ZUN
IPC: A61K31/409
Filed: 2010-08-17
Abstract: PURPOSE: A method for preparing chlorophyll and chlorine e6 from chlorophyll extract is provided to improve the purity of chlorine e6. CONSTITUTION: A method for preparing chlorohpyll of high purity comprises: a step of extracting green plants or green algae containing chlorophyll using methanol, ethanol, acetone or solution thereof; a step of adding hexane and water to the chlorophyll extract; and a step of placinhg the extract at -20°C to 0°C and purifying the chlorophyll of high purity. A method for preparing chlororine e6 comprises: a step of extracting the green plants or microalgae with methanol, ethanol, acetone or solution thereof; a step of mixing the chlorophyll extract with hexane and water; a step of placing the solution at -20°C to 0°C to purify chlorophyll of high purity; a step of dissolving the purified chlorophyll in solvent and adding acid; a step of adding water and obtaining pheophytin precipitate; and a step of adding base and reacting at 0°C-120°C.
Patent KR-20120019991-A (KR)
Title: Lng vaporizing system and method of vaporizing lng
Inventor: LEE HO KI
IPC: F17C9/02
Filed: 2010-08-27
Abstract: PURPOSE: LNG vaporizing system and method are provided to control the temperature of natural gas passing through a vaporizer and control the amount of heat exchange medium flowing to the vaporizer. CONSTITUTION: An LNG vaporizing system comprises a vaporizer(102), a heat exchange medium line, a heat exchange medium control unit(124), and a natural gas flow line. The vaporizer vaporizes LNG to vaporized natural gas and comprises an LNG inlet and a vaporized natural gas outlet. The heat exchange medium line passes through the vaporizer and heat exchange medium heat-exchanging with the LNG flows in the heat exchange medium line. The heat exchange medium control unit controls the heat exchange medium flowing in the heat exchange medium line. The natural gas flow line is connected to the vaporizer.
Patent KR-20120025853-A (KR)
Title: Noise eliminating circuit
Inventor: PARK YOUNG HEE
IPC: H04B1/16
Filed: 2010-09-08
Abstract: PURPOSE: A noise eliminating device is provided to separate a noise mixed signal into several delayed signals as long as a time interval available for communication, thereby offsetting the signals. CONSTITUTION: A noise eliminating device(10) divides an input signal into three identical signals. The noise eliminating device delays one of the three signals for a predetermined time. The noise eliminating device delays another signal in the same way. The noise eliminating device performs phase inversion of another signal. The noise eliminating device passes through the other signal. The noise eliminating device combines the signals.
Patent KR-20120028501-A (KR)
Title: 일정관리부
Inventor: KIM YONG U
IPC: B42D12/02
Filed: 2010-09-15
Abstract: 본 발명은 내지부가 구비된 일정관리부에 관한 것으로, 상기 내지부는, 일요일은 한 칸으로 구성되고, 월요일부터 토요일까지는 요일별로 하루의 일과시간에 대해 매 30분 단위로 한 칸으로 구성되어 상기 하루의 일과시간의 활동내역을 기재할 수 있는 일일시간기록란; 및 상기 일일시간기록란의 상단에 전월, 금월 및 익월이 표시된 달력표시란을 포함하되, 상기 달력표시란은 각 쪽마다 표시되는 것을 특징으로 한다. 
상기와 같은 본 발명에 따르면, 매 30분 단위로 활동내역사항 등을 자세히 기재하여 중요지식자원을 활용하기 용이하도록 구분되게 기재함으로써 개인의 시간관리를 철저히 할 수 있고, 개인 삶의 질을 향상시키도록 하는 데도 탁월한 효과가 있다.
Patent KR-20120029220-A (KR)
Title: Mobile terminal and operation method thereof
Inventor: HONG KYUNG AH
IPC: H04B1/40
Filed: 2010-09-16
Abstract: PURPOSE: A portable terminal and operating method thereof are provided to enable a user to dynamically select menus by providing various menus and by opening a polyhedron for selecting the menu. CONSTITUTION: A control unit(180) overlaps a part of three dimensional images in the first area of a touch screen. The control unit receives a user command which touches the first area. The control unit movingly displays one or more three dimensional object images in order not to overlap the three dimensional object images in the first area. The control unit receives a second user command which drags a second area of a touch screen in the first area. The control unit displays the three dimensional object image displayed on the second area.
Patent KR-20120030228-A (KR)
Title: 혼자서도 쉽게 연습가능한 야구공
Inventor: KIM SO YEON
IPC: A63B37/12
Filed: 2010-09-18
Abstract: 본 발명은 혼자서도 쉽게 연습이 가능한 야구공에 있다. 본 발명은 사용자가 연습시 알아보기 쉽도록 공을 잡는 방법을 도식화에 나타냄으로써 사용자가 혼자서도 바른 손 위치를 익힐 수 있음으로 사용자의 부상을 막을 수 있고, 빠른 실력향상을 도와주는 형태의 연습구이다.
Patent KR-20120032834-A (KR)
Title: Processing device of exhaust gas for absorbing column
Inventor: CHO CHAN YONG
IPC: B01D53/30
Filed: 2010-09-29
Abstract: PURPOSE: An exhaust gas treating apparatus for an adsorption column is provided to automate an exhaust gas backward flowing preventive process by comparing the pressures of exhaust gas and the supplying pressures of ammonia and adjusting the supplying flux of nitrogen. CONSTITUTION: An exhaust gas treating apparatus for an adsorption column includes a treating part(1). The treating part includes a lower layer part(10), an upper layer part(20), a supplying part(40), and a lower adjusting part(50). The supplying part supplies nitrogen to the lower layer part and the upper layer part. The lower adjusting part is arranged at the supplying part and prevents the backward flowing of exhaust gas at the lower layer part. The treating part further includes a gas measuring part(60), a nitrogen measuring part(70), and a controlling part(80). The gas measuring part is arranged at the lower layer part and measures the pressures of exhaust gas. The nitrogen measuring part is arranged at the supplying part and measures the supplying pressure of nitrogen. The controlling part receives signals from the gas measuring part and the nitrogen measuring part and controls the lower adjusting part.
Patent KR-20100112544-A (KR)
Title: Non-invasive blood glucose measurement apparatus
Inventor: JUNG SOON WON
IPC: A61B5/145
Filed: 2010-09-29
Abstract: PURPOSE: A non-invasive blood sugar measuring device is provided to prevent the physical pain of a subject due to blood-collecting by measuring the blood sugar using vein recognition technique. CONSTITUTION: A blood vessel information registering unit(100) registers blood vessel information inside a specific skin area. The blood vessel information registering unit includes a blood vessel image photographing unit(110), a blood vessel information extracting unit(120), and a blood vessel information storing unit(130). The blood vessel image photographing unit photographs the blood vessel image inside a skin. The blood vessel information extracting unit stores the blood vessel information extracted from the blood vessel information extracting unit. A blood sugar value determining unit(200) determines the blood sugar value in the blood based on the blood vessel information obtained from the blood vessel information registering unit. The blood sugar value determining unit is comprised of a blood vessel matching unit(210) and a blood sugar measuring unit(220) to measure the blood sugar value.
Patent KR-20120037558-A (KR)
Title: Active noise cancelling film speaker amplifier
Inventor: LEE HYUN WOO
IPC: H04R17/00
Filed: 2010-10-12
Abstract: PURPOSE: An amplifier ideal for a film speaker for controlling active noises is provided to smoothly drive a film speaker for controlling active noises by using a piezo actuator. CONSTITUTION: An amplifier ideal for a film speaker for controlling active noises comprises a primary amplifier(10), a secondary amplifier(11), and a piezo actuator(12). The first amplifier amplifies a first voltage in a first amplification ratio. The first amplifier provides a direct current voltage of +175V and -175V. The secondary amplifier amplifies a second voltage in a second amplified ratio. The secondary amplifier provides the direct current voltage of +175V and -175V. The piezo actuator is driven by a voltage applied from the primary amplifier and the secondary amplifier. The piezo actuator runs a film speaker for controlling active noises by generating sound pressure.
Patent KR-20110040714-A (KR)
Title: Electronic device and recording medium
Inventor: SUZUKI MAHO
IPC: G06F3/037
Filed: 2010-10-13
Abstract: PURPOSE: An electronic device and a recording medium are provided to reduce detection errors of a touch panel based on the relation with a wireless device operating frequency. CONSTITUTION: A radio frequency specifying unit specifies a frequency used by a wireless device(120), and specifies the operation frequency of the touch panel which does not use the wireless frequency and interference specified by at least wireless frequency specifying unit. A touch panel driving unit(111) drives the touch panel in the operation frequency specified by the operation frequency specifying unit. A display control unit switches a current frequency in the display frequency specified by the specifying unit. The display control unit operates the display unit.
Patent KR-20120038277-A (KR)
Title: 철근 연결 방법 및 장치
Inventor: GIL IN HWAN
IPC: E04C5/16
Filed: 2010-10-13
Abstract: 본 발명은 철근 연결 방법 및 장치에 관한 것이다. 
본 발명의 철근연결장치는, 평평한 판 형태로 형성되어 있되, 수직축을 기준으로 수직철근을 감싸도록 밴딩이 가능하도록 구성되어 있는 밴딩부와; 상기 밴딩부의 좌, 우 양측에 형성되어 있으며, 상, 하 양측 끝단 중 어느 한 변으로부터 반대편 변을 향해 일정 깊이까지 형성되어 있되, 좌, 우 양측의 상, 하로 서로 엇갈려 형성되어 있는 두 개의 가이드홈과; 상기 가이드홈과 연속하여 가이드홈 끝단에 형성되어 있으며, 수평철근을 감싸도록 라운드지게 형성되어 있는 철근관통홀과; 상기 두 가이드홈과 인접하여 외측 방향에 밴딩부와 일체로 형성되어 있으며, 중앙 수평축을 기준으로 밴딩이 가능하도록 구성되어 있는 날개부;를 포함하여 구성된다. 
 본 발명에 의해, 첫째 두 개의 직교한 철근을 단순한 작업만으로도 상호 체결할 수 있으며, 둘째, 표준화된 규격을 갖춘 철근 연결장치이므로 이를 대량 생산화하여 준비할 수 있으며, 세째 철근 연결작업시 체결강도를 보장할 수 있게 되고, 네째 단순한 작업으로 인해 작업자의 피로도를 경감시킬 수 있다.
Patent KR-20120043316-A (KR)
Title: Drainage device on floor having
Inventor: CHAE HAE GWON
IPC: E03C1/28
Filed: 2010-10-26
Abstract: PURPOSE: A drainpipe device for a floor is provided to reduce construction costs by forming a water collecting pipe used as a drain trap to be movable. CONSTITUTION: A drainpipe device for a floor comprises a drainpipe device body(200), first and second bottom planes(210,220), one or more elbow fasteners, and a drainpipe fastener(240). The first bottom plate is attached on the bottom of the drainpipe device body, and the second bottom plane is separated from the bottom of the drainpipe device body. The elbow fasteners are extended downward to penetrate through the second bottom plane. The drainpipe fastener is formed on the side wall of the drainpipe device body.
Patent KR-20120044756-A (KR)
Title: Thermal device for power converting module
Inventor: SOHN YOUNG HO
IPC: H02M3/00
Filed: 2010-10-28
Abstract: PURPOSE: The heat emitting apparatus of a power converting module is provided to improve heat emitting performance by simultaneously emitting heat through a case with heat emitting pins and a high heat emitting heat sink. CONSTITUTION: A heat emitting apparatus(200) includes a case(210), a high heat emitting heat sink(220), a circuit board, and a combining member. The case includes a heat emitting pin part(211) and a space part. The heat emitting pin part is composed of a plurality of heat emitting pins. The space part is formed between the heat emitting pins. The high heat emitting heat sink is based on aluminum or copper and is mounted at the space part of the case. The circuit board includes a power converting element and is combined with the lower part of the case. The space part of the case is formed at the high heat emitting part which highly emits heat from the circuit board.
Patent KR-20120046851-A (KR)
Title: Non-electric automatic control water door
Inventor: JEONG HYE JIN
IPC: E02B7/20
Filed: 2010-10-29
Abstract: PURPOSE: A non-motorized automatic control water gate using a water level is provided to prevent foreign materials from piling up inside a drainpipe by automatically controlling the opening and closing of the water gate in real time. CONSTITUTION: A non-motorized automatic control water gate using a water level comprises a drainpipe, a water gate frame(70), a water gate(10), a rotating unit(20), and an opening and closing unit(40). The drainpipe drains branch river water to a main river. The water gate frame has an incline fixed to the front end of the drainpipe. The water gate is installed at the front of the water gate frame and controls the flow of water. The rotating unit rotates the water gate. The opening and closing unit is connected to the front of the water gate and opens and closes the water gate depending on the water level of the main river.
Patent KR-20120046955-A (KR)
Title: Routing method using broadcasting message of sink node in wireless sensor networks
Inventor: LEE SUNG KEUN
IPC: H04L12/28
Filed: 2010-11-03
Abstract: PURPOSE: A routing method using a broadcast message of a sync node in a wireless sensor network is provided to reduce transmission and reception data amount by changing an updating method. CONSTITUTION: A sync node broadcasts a route message(20) including a route which is facing to a node. Plural sensor nodes update a routing table based on the received route message. The route message includes a route message identifier(210) and the information of a target node. The information of a calling node includes a residual energy level(228) and a hop count(226) which is restricted from the node to the sync node.
Patent KR-20100129255-A (KR)
Title: Display stand for electric mat
Inventor: CHOI EUN SEOK
IPC: A47F5/10
Filed: 2010-11-09
Abstract: PURPOSE: A display stand for electric mats is provided, which enables consumers to easily confirm the property of products by classifying electric mats according to the kind. CONSTITUTION: A display stand for electric mats comprises: perpendicular frames(30) which are perpendicularly installed on both sides while keeping an interval between frames; a plurality of support plates(20) which are horizontally installed between both sides of the perpendicular frames at a constant interval and in which an electric mat is settled; and a sliding member(50) which is installed to be slid between the support plate and perpendicular frame.
Patent KR-20120052648-A (KR)
Title: Apparatus for transferring graphene and method for transferring graphene
Inventor: YOON JONG HYUK
IPC: B41F17/00
Filed: 2010-11-16
Abstract: PURPOSE: A grapheme transferring apparatus and a method for transferring a grapheme are provided to prevent a damage of a grapheme caused by overheat of a heat release film and transferring object film or an unequal expansion because a heating unit is maintained at low temperatures. CONSTITUTION: A grapheme transferring apparatus(1) comprises a first roller(100), a second roller(200), and a heating unit(300). The first roller presses a heat release film(10) and transferring object film(20) so that a grapheme of the heat release film is attached to the and transferring object film. The second roller heats the films while pressing the heat release film and transferring object film so that adhesive strength of the heat release film passed through the first roller is lost. The heating unit preheats the heat release film between the first and second rollers.